The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 05, 1994
Filed:
Sep. 25, 1992
Applicant:
Inventors:
Yasuyuki Nakamura, Itami, JP;
Toshio Kumamoto, Itami, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03M / ;
U.S. Cl.
CPC ...
341144 ; 341118 ;
Abstract
In order to improve linearlity of analog current outputs with respect to input digital codes in a D-A converter formed by a matrix array of unit current sources, respective current source cells forming the matrix are connected by analog ground wires (101 to 105 ) along respective rows. Analog ground wires (301, 302 ) connect left sides of the analog ground wires (102, 104) and right sides of the analog ground wires (101, 103, 105) to pads (41, 42 ) respectively, to ground the same. Thus, large-small relations of current distributions are reversed in respective rows, whereby influences by the current distributions are cancelled.